The 'Access Credentials' are used to specify a list of credentials used by the Management Server to install the Deployment Agent (CCA). These credentials must be supplied before attempting to install the Deployment Agent (CCA) on any endpoint via the Management Console.
Home > Global Settings > Access Credentials tab
Or per Deployment Group in Home > Deployment Groups > [Deployment Group] > Details section > Manage Credentials button.
Access Credentials configured through Global Settings apply to all Deployment Groups by default, unless specific credentials have been defined within a specific Deployment Group. In this case, the Deployment Group’s Access Credentials precede the default global credentials.